The trick is simple but first u have to have a s-video out in ur pc and a 3.5mm both sided male jack
So if u have these things then u just have to connect the s-video out in the comp. as well as the a3 the attach the 3.5 mm cable to the speaker out of ur pc and in to ur cowon line in av ponit then open the recorder option and in settings select s-video as ur video in option and record it will record the video as well as the audio